diff -r 6a376615142e -r d4bb66691248 graphics/GraphicCommons.py
--- a/graphics/GraphicCommons.py	Sat Mar 31 15:03:50 2012 +0200
+++ b/graphics/GraphicCommons.py	Sat Mar 31 15:08:18 2012 +0200
@@ -416,6 +416,8 @@
     
     # Method that returns the currently edited box
     def GetCurrentExtent(self):
+        if self.currentBox is None:
+            return self.lastBox
         return self.currentBox
     
     # Method called when a new box starts to be edited